C++ practice questions for assignment presentation

coding cpp

1. Pratima Kumari
PRN: 250850150061




















C++ Assignment 2

2. Q.1
Create a class Student with:
public variables: name, age.
A method display() to print student details.
In main(), create a Student object, assign values directly, and display them.
(This shows that public members are accessible outside the class.)


#include <iostream>
using namespace std;

class Student {
public:
string name;
int age;

void display() {
cout << "Student Name: " << name << endl;
cout << "Student Age: " << age << endl;
}
};

3. int main()
{
// Creating Student object
Student s1;

// Assigning values directly to public variables
s1.name = "Pratima";
s1.age = 27;

// Displaying details
s1.display();

return 0;
}

4. OUTPUT

5. Q 2: Understanding private
Create a class BankAccount with:
private variables: accountNumber, balance.
public methods: setDetails(), getDetails().
In main(), try to directly access balance → observe error.
(This shows that private protects data from direct access.)

#include <iostream>
using namespace std;

class BankAccount {
private:
int accountNumber;
double balance;

public:
// Method to set account details
void setDetails(int accNo, double bal) {
accountNumber = accNo;
balance = bal;
}

6. // Method to get account details
void getDetails() {
cout << "Account Number: " << accountNumber << endl;
cout << "Balance: " << balance << endl;
}
};

int main() {
BankAccount acc;

// Setting account details using method
acc.setDetails(12345, 5000.75);

// Getting account details
acc.getDetails();

return 0;
}

7. OUTPUT

8. Q 3: Combining private and public
Create a class Rectangle with:
private variables: length, width.
public methods:
setDimensions() to assign values,
getArea() to return area.
In main(), demonstrate that dimensions cannot be accessed directly, but area can be
computed using methods.

#include <iostream>
using namespace std;

// Q3: Demonstrating private + public in a class
class Rectangle {
private:
double length;
double width;

public:
// Method to set dimensions
void setDimensions(double l, double w) {
length = l;

9. width = w;
}

// Method to calculate and return area
double getArea() {
return length * width;
}
};

int main() {
Rectangle rect;

// Setting values using method
rect.setDimensions(10.5, 4.2);

// Computing area using public method
cout << "Area of Rectangle: " << rect.getArea() << endl;

return 0;
}

10. OUTPUT

11. Q 4: Encapsulation in Practice
Create a class Employee with:
private variables: id, salary.
public methods:
setData() to set values,
displayData() to print details.
In main(), show how id and salary are hidden and only controlled via methods.

#include <iostream>
using namespace std;

// Q4: Encapsulation Example
class Employee {
private:
int id;
double salary;

public:
// Method to set employee details
void setData(int empId, double empSalary) {

12. id = empId;
salary = empSalary;
}

// Method to display employee details
void displayData() {
cout << "Employee ID: " << id << endl;
cout << "Employee Salary: " << salary << endl;
}
};

int main() {
Employee e1;

// Setting values through public method
e1.setData(101, 55000.75);

// Displaying values using public method
e1.displayData();
return 0;
}

13. OUTPUT

14. Q 5: Small Challenge
Create a class Car with:
private variable: engineNumber.
public variables: brand, model.
public method showDetails().
In main(), let students try to access engineNumber
→ it should fail.

#include <iostream>
using namespace std;
class Car {
private:
string engineNumber; // Private variable

public:
string brand; // Public variables
string model;

// Method to set engine number (since it's private)
void setEngineNumber(string engNo) {
engineNumber = engNo;

15. }

// Method to show details
void showDetails() {
cout << "Brand: " << brand << endl;
cout << "Model: " << model << endl;
cout << "Engine Number: " << engineNumber << endl;
}
};

int main() {
Car car1;
// Assign public members directly
car1.brand = "Toyota";
car1.model = "Corolla";
car1.setEngineNumber("ENG12345XYZ");
car1.showDetails();

return 0;
}

16. OUTPUT